Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
cham tuc » nham thuc, tham thuc, cham soc
va hanh » van hanh, va thanh, va danh
sach ty » sach y, sach thu, xach tay
lang xa » lang ha, dang xay, lang van
sach tu » sach thu, cach tu, sach uu
cuc tre » duc tre, cua tre, cuu tre

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) or (sach tu)) lang xa hoi. hieu van ((cham tuc) or (pham thuc)) va hanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach tu)) lang xa hoi. hieu van ((cham tuc) OR (pham thuc)) va hanh tai cuc tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach tu)) lang xa hoi. hieu van ((cham tuc) or (pham thuc)) va hanh tai cuc tre*.