Perhaps you should try some spelling variations:
chau triet » cau triet, cua triet, cau trieu
lan chau » lai chau, tran chau, luan chat
thu sach » thuat sach, thuoc sach, thu hoach
gian lan » gian lang, gian dan, giang van
hieu van » hieu va, thien van, lieu va
hac duc » ha duc, thach duc, pham duc
va gian » va gianh, van gian, va giai
hoc duc » hoc duoc, hoc nuoc, hoc thuc
tu sach » su sach, te sach, tu cach
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) ty lang xa hoi. hieu van ((hac duc) OR (hoc duc)) va gian lan chau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ty lang xa hoi. hieu van ((hac duc) OR (hoc duc)) va gian lan chau triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ty lang xa hoi. hieu van ((hac duc) OR (hoc duc)) va gian lan chau triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ty lang xa hoi. hieu van ((hac duc) OR (hoc duc)) va gian lan chau triet*.