Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang van » dang van, tang van, lang van
chat duc » chat xuc, chat doc, chet duoc
tu sach » thu sach, su sach, te sach
van hoi » van hoa, van hoc, van hoe
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
va lanh » va lang, va danh, va hanh
dao cua » dai cua, dan cua, do cua
day cua » dai cua

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 (toc sach)) ky nang van hoi. hieu va chat duc va lanh ((dao cua) OR (day cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ky nang van hoi. hieu va chat duc va lanh ((dao cua) OR (day cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (toc sach)) ky nang van hoi. hieu va chat duc va lanh ((dao cua) OR (day cua)) te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ky nang van hoi. hieu va chat duc va lanh ((dao cua) OR (day cua)) te*.