Perhaps you should try some spelling variations:
kham truc » nham thuc, pham thuc, kham trai
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
truc va » thuc va, thuc vat, trung va
dan day » da day, dan dat, dan da
day cua » dai cua
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang ma hoi. ((((hieu va) OR (lieu va))) or (hieu qua)) kham truc va dan day cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ma hoi. ((((hieu va) OR (lieu va))) OR (hieu qua)) kham truc va dan day cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ma hoi. ((((hieu va) OR (lieu va))) or (hieu qua)) kham truc va dan day cua tre*".