Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
cham tuc » nham thuc, pham thuc, cham soc
toc sach » hoc sach, doc sach, thuoc sach
hanh doi » thanh doi, hanh noi, hang doi
doi cua » dai cua, hoi cua, dong cua
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ly nang » ky nang, ly hang, ly vang
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: ((te sach) OR (toc sach)) ly nang xa hoi. hieu ve ((cham tuc) or (tham thuc)) va hanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ly nang xa hoi. hieu ve ((cham tuc) OR (tham thuc)) va hanh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ly nang xa hoi. hieu ve ((cham tuc) or (tham thuc)) va hanh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ly nang xa hoi. hieu ve ((cham tuc) or (tham thuc)) va hanh doi cua tre*.