Perhaps you should try some spelling variations:
thien van » thi van
tham thuc » pham thuc, tam thuc, thai thuc
nham thuc » nhan thuc, nam thuc, nham thu
toc sach » hoc sach, doc sach, thuoc sach
kinh dat » dinh dat, kinh dao, chinh dat
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va kinh » va tinh, qua kinh
dat cua » dai cua, day cua, mat cua
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. thien van ((tham thuc) OR (nham thuc)) va kinh dat cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang xa hoi. thien van ((tham thuc) OR (nham thuc)) va kinh dat cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. thien van ((tham thuc) OR (nham thuc)) va kinh dat cua tre*.