Perhaps you should try some spelling variations:
sach thien » sach tien, cach thien, sach tren
va hanh » van hanh, va thanh, va danh
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cam duc » cao duc, pham duc, nam duoc
hanh de » hanh ve, hanh kem
de cua » le cua, te cua, dieu cua
cua tu » cua tuc, cua su, cua cu

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 thien) or (sach thieu)) nang xa hoi. hieu va ((cam duc) OR (cam xuc)) va hanh de cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach thien) OR (sach thieu)) nang xa hoi. hieu va ((cam duc) OR (cam xuc)) va hanh de cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach thien) or (sach thieu)) nang xa hoi. hieu va ((cam duc) OR (cam xuc)) va hanh de cua tu".
• Adding a wildcard symbol may retrieve word variants: te ((sach thien) or (sach thieu)) nang xa hoi. hieu va ((cam duc) OR (cam xuc)) va hanh de cua tu*.