Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
cham tuc » nham thuc, pham thuc, tham thuc
thai cuu » thai cua, thi cuc, thai xu
tu sach » su sach, te sach, tu cach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va hanh » van hanh, va thanh, va danh
tuc va » thuc va, truc va, tuc xa

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)) ky nang ma hoa. hieu ve cham tuc va hanh ((thai cuu) OR (tai cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang ma hoa. hieu ve cham tuc va hanh ((thai cuu) OR (tai cuc)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang ma hoa. hieu ve cham tuc va hanh ((thai cuu) OR (tai cuc)) tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang ma hoa. hieu ve cham tuc va hanh ((thai cuu) OR (tai cuc)) tre*.