Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, thai thuc
toc sach » hoc sach, doc sach, thuoc sach
tam thuc » am thuc, nam thuc, dam thuc
dinh cac » tinh cach, dinh chuc, dinh chau
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
thi van » thi lan, thi hanh, thi nang
dinh ca » dinh cua, dinh cao, dinh ba
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang xa hoi. thi van ((tham thuc) OR (tam thuc)) va ((dinh ca) or (dinh cac)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. thi van ((tham thuc) OR (tam thuc)) va ((dinh ca) OR (dinh cac)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang xa hoi. thi van ((tham thuc) OR (tam thuc)) va ((dinh ca) or (dinh cac)) cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. thi van ((tham thuc) OR (tam thuc)) va ((dinh ca) or (dinh cac)) cua tre*.