Perhaps you should try some spelling variations:
thien van » thi van
tham thuc » nham thuc, pham thuc, tam thuc
toc sach » hoc sach, doc sach, thuoc sach
cham tuc » nham thuc, pham thuc, cham soc
kinh dat » dinh dat, kinh dao, chinh dat
va kinh » va tinh, qua kinh
dat cua » dai cua, day cua, mat cua
cua tre » cua te, cuu tre, cua triet
y nang » ly nang, v nang, may nang

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 ((y nang) OR (ky nang)) xa hoi. thien van ((cham tuc) or (tham thuc)) va kinh dat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((y nang) OR (ky nang)) xa hoi. thien van ((cham tuc) OR (tham thuc)) va kinh dat cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((y nang) OR (ky nang)) xa hoi. thien van ((cham tuc) or (tham thuc)) va kinh dat cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ((y nang) OR (ky nang)) xa hoi. thien van ((cham tuc) or (tham thuc)) va kinh dat cua tre*.