Perhaps you should try some spelling variations:
lang mai » lang dai, lang hai, lang man
tang mai » tang ma, tang tai, sang mai
hieu cao » chieu cao, hieu cac, hieu ca
quoc ban » quoc bao, quoc lan, quoc quan
ban hanh » ban hang
hanh vai » hanh vi, hanh va, hanh tai
cao han » cao nhan, cao phan, cao van
vai cua » dai cua, hai cua, lai cua
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky ((tang mai) or (lang mai)) hoi. hieu cao han quoc ban hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky ((tang mai) OR (lang mai)) hoi. hieu cao han quoc ban hanh vai cua te.
• Adding a wildcard symbol may retrieve word variants: tu san ky ((tang mai) or (lang mai)) hoi. hieu cao han quoc ban hanh vai cua te*.