Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
cham tuc » pham thuc, tham thuc, cham soc
tinh pho » tinh phu, tich pho, tinh cho
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
pho cau » pho cap, pha cau, pho cam

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 ky nang xa hoi. hieu ve ((cham tuc) or (nham thuc)) may tinh pho cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ve ((cham tuc) OR (nham thuc)) may tinh pho cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ve ((cham tuc) or (nham thuc)) may tinh pho cau tren*.