Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
dinh lai » dinh lam, dinh lap, dinh tai
cham loc » cham soc, chon loc, hau loc
cua viet » ca viet, hoa viet, cua vat
hieu va » lieu va, hieu qua
sach tu » sach thu, cach tu, sach ty
tang ma » mang may, tang van
va dinh » van dinh, va kinh, va tinh
lai cua » dai cua, hai cua, lai chau
cham o » cham soc

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 tu ((tang ma) or (nang x)) hoi. hieu va ((cham loc) OR (cham o)) va dinh lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach tu ((tang ma) OR (nang x)) hoi. hieu va ((cham loc) OR (cham o)) va dinh lai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach tu ((tang ma) or (nang x)) hoi. hieu va ((cham loc) OR (cham o)) va dinh lai cua viet".
• Adding a wildcard symbol may retrieve word variants: thuat sach tu ((tang ma) or (nang x)) hoi. hieu va ((cham loc) OR (cham o)) va dinh lai cua viet*.