Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, khau sach
nang van » dang van, tang van, lang van
pham duy » pham duc
cau theo » cau thi, cau tao
tu sach » su sach, te sach, tu cach
van hoi » van hoa, van hoc, van hoe
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
va danh » va dinh, va dan, va hanh
danh ve » dinh ve, hanh ve, anh ve
duy va » duy vat, duy van, day va
ve cau » ke cau, va cau, ve cac

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) OR (thu hoach)))) ky nang van hoi. hieu va pham duy va danh ve cau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (((thu sach) OR (thu hoach)))) ky nang van hoi. hieu va pham duy va danh ve cau theo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (((thu sach) OR (thu hoach)))) ky nang van hoi. hieu va pham duy va danh ve cau theo".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (((thu sach) OR (thu hoach)))) ky nang van hoi. hieu va pham duy va danh ve cau theo*.