Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
vat cua » mat cua, bat cua, dat cua
dan vat » dang vat, van vat, dan va
cao suc » cao su, cao duc
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
va dan » ca dan, va dao, va dau
ma hoi » mai hoi, ma hoa, me hoi
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky nang ((ma hoi) OR (xa hoi)). hieu ve ((pham duc) or (cao suc)) va dan vat cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang ((ma hoi) OR (xa hoi)). hieu ve ((pham duc) OR (cao suc)) va dan vat cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang ((ma hoi) OR (xa hoi)). hieu ve ((pham duc) or (cao suc)) va dan vat cua te".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang ((ma hoi) OR (xa hoi)). hieu ve ((pham duc) or (cao suc)) va dan vat cua te*.